package com.walmartlabs.concord.runtime.v2.runner;

/*-
 * *****
 * Concord
 * -----
 * Copyright (C) 2017 - 2020 Walmart Inc.
 * -----
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =====
 */

import javax.inject.Singleton;
import java.util.ArrayList;
import java.util.List;

@Singleton
public class DefaultSynchronizationService implements SynchronizationService {

    private final List<Runnable> callbacks = new ArrayList<>();

    @Override
    public boolean hasPoint() {
        synchronized (this) {
            return !callbacks.isEmpty();
        }
    }

    @Override
    public void maintain() {
        for (Runnable callback : callbacks) {
            callback.run();
        }

        callbacks.clear();
    }

    @Override
    public void point(Runnable callback) {
        synchronized (this) {
            callbacks.add(callback);
        }
    }
}
